More restructuring

src/Nadeko.Bot.Modules.Searches/Search/Youtube/YtdlxServiceBase.cs

@@ -0,0 +1,34 @@
+namespace NadekoBot.Modules.Searches.Youtube;
+
+public abstract class YoutubedlxServiceBase : IYoutubeSearchService
+{
+    private YtdlOperation CreateYtdlOp(bool isYtDlp)
+        => new YtdlOperation("-4 "
+                             + "--geo-bypass "
+                             + "--encoding UTF8 "
+                             + "--get-id "
+                             + "--no-check-certificate "
+                             + "--default-search "
+                             + "\"ytsearch:\" -- \"{0}\"",
+            isYtDlp: isYtDlp);
+
+    protected async Task<VideoInfo?> InternalGetInfoAsync(string query, bool isYtDlp)
+    {
+        var op = CreateYtdlOp(isYtDlp);
+        var data = await op.GetDataAsync(query);
+        var items = data?.Split('\n');
+        if (items is null or { Length: 0 })
+            return null;
+
+        var id = items.FirstOrDefault(x => x.Length is > 5 and < 15);
+        if (id is null)
+            return null;
+
+        return new VideoInfo()
+        {
+            Url = $"https://youtube.com/watch?v={id}"
+        };
+    }
+
+    public abstract Task<VideoInfo?> SearchAsync(string query);
+}